JPH06327188A - Vibration-proof rubber - Google Patents

Abstract

PURPOSE:To provide a vibration-proof rubber by which heat generated from a motor is dissipated effectively and whose thermal conductivity is excellent. CONSTITUTION:A rubber at a thermal conductivity of 1.3X10<-3> to 7.1X10cal/am sec deg.C is used as a rubber material 11 for a vibration-proof rubber 10 which is formed by bonding metal fittings 12, 13 to both edges of the rubber material 11. Alternatively, a rubber in which graphite at 50 to 200 pts.wt. has been compounded with a rubber at 100 pts.wt. is used as the rubber material 11 for the vibration-proof rubber 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration rubber used for feeding paper in a facsimile machine, a copying machine or the like, or for preventing vibration and noise of a stepping motor used in a print head of a printer.

[0002]

2. Description of the Related Art In recent years, as offices have become OA,
The noise generated by the A-device itself has come to the fore. One of the causes of this noise is that when the motor built in the OA equipment is driven, the vibration of the motor is transmitted to the mounting plate for the equipment. Therefore, conventionally, a vibration proof rubber has been interposed between the motor and the mounting plate of the device main body to prevent transmission of vibration and suppress noise. Figure 2
Fig. 1 shows a vibration-proof rubber 1 used in a stepping motor.
The anti-vibration rubber 1 is obtained by vulcanizing and adhering a rubber material 4 (chloroprene rubber, butyl rubber, etc.) between two metal fittings 3, 3 having mounting holes 2, 2, ... Thus, the hollow hole 5 is provided in the center. The anti-vibration rubber 1 as described above is fixed to the mounting plate 6 of the device and the bottom plate 8 of the stepping motor 7 by bolting the mounting holes 2, 2, ... As shown in FIG.

[0003]

However, since the rubber has a heat insulating property, when the motor is driven through the anti-vibration rubber 1, the heat generated by the motor is insulated by the rubber 4 and stored in the motor itself. Therefore, it is difficult to obtain excellent motor characteristics, and the service life is shortened.

Therefore, an object of the present invention is to provide an anti-vibration rubber which is excellent in thermal conductivity so that the heat generated by the motor is effectively released.

[0005]

The vibration-proof rubber of the present invention according to claim 1 is a vibration-proof rubber in which metal fittings are adhered to both end surfaces of the rubber material, and the thermal conductivity of the rubber material is 1.3. × 10 ^-3
It is characterized in that it is 〜7.1 × 10 ^-3 cal / cm sec ℃. The vibration-proof rubber of the present invention according to claim 2 is a vibration-proof rubber in which metal fittings are adhered to both end surfaces of the rubber material, wherein the rubber material is graphite 50 to 200 per 100 parts by weight of the rubber.
It is characterized by being mixed with parts by weight.

[0006]

The anti-vibration rubber of the present invention has a thermal conductivity of 1.3 × 10 ^{−3 to} 7.1 × 1 as a rubber material having metal fittings on both end surfaces thereof.
By using a rubber material with good thermal conductivity of 0 ^-3 cal / cm sec ℃, when the motor and equipment are connected via a vibration proof rubber, the heat generated by the operation of the motor is It passes through the rubber material from the metal fitting and is transmitted to the other metal fitting,
Since heat is dissipated from the mounting plate having a large surface area, the rise in temperature of the motor itself is suppressed. The rubber used in the rubber material of the present invention includes natural rubber (NR) and chloroprene rubber (C
R), ethylene-propylene-diene rubber (EPD
M), butyl rubber (IIR), styrene-butadiene rubber (SBR), butadiene rubber (BR), chlorosulfonated polyethylene (CSM), silicone rubber (S
i), ethylene-propylene rubber (EPM), epichlorohydrin-ethylene oxide rubber (ECO), etc., and may be one kind alone or a mixture of plural kinds. The thermal conductivity of the anti-vibration rubber is 1.3 × 10 ^-3 cal / cm sec.
The reason for using a rubber material above ℃ is 1.3 × 10 ^-3 cal /
If it is less than cm sec ℃, when the motor is fixed via the anti-vibration rubber and the motor is operated for 1 hour continuously, the temperature of the motor becomes 85 ℃ and exceeds the continuous operating limit temperature (permissible temperature) of the motor. I will end up. With stepping motors, positioning accuracy deteriorates if this continuous service limit temperature is exceeded,
For example, in a sub-micron order positioning device using a ball screw, the heat transmitted from the motor shaft expands the ball screw on the motor side, which may cause an error in the feed amount. Therefore, it is desirable that the operating temperature of the motor does not exceed 80 ° C. Also, considering the heat dissipation of the anti-vibration rubber, the higher the thermal conductivity of the rubber material is, the better the rubber material applied to the anti-vibration rubber is because of the workability and anti-vibration characteristics of the rubber. It is considered that a range not exceeding 10 ^-3 cal / cm sec ° C is appropriate. Further, as the rubber material of the anti-vibration rubber, 50 parts by weight or more of graphite is added to 100 parts by weight of rubber,
The reason for using a mixture of 0 parts by weight or less is that the rubber 1
When the amount of graphite is less than 50 parts by weight with respect to 00 parts by weight, the thermal conductivity does not exceed 1.3 × 10 ⁻³ cal / cm sec ° C. and a rubber material having sufficient thermal conductivity is obtained. This is because it cannot be obtained. When graphite is blended in an amount of more than 200 parts by weight, the hardness of rubber becomes 80 ° or more. The hardness of the rubber material used in the present invention is preferably Hs 30 ° to 80 °. (Measured by a spring hardness tester according to JIS K 6301) When the hardness of rubber is 80 ° or more, the workability is deteriorated, and it is difficult to inject it into a mold for vulcanization molding. In addition, there is a problem that wear of the metal fitting also increases. Carbon rubber is used in combination with graphite in such a rubber material in an amount of 1 to 100 with respect to 100 parts by weight of the rubber.
If it is compounded in an amount of 1 part by weight, the thermal conductivity will be further improved and the strength will be increased, but if it is compounded in an amount of more than 100 parts by weight, the rubber will become too hard and the flexibility will decrease. As shown in FIG. 4, the thermal conductivity of rubber and the compounding amount of graphite have a close relationship, but if 100 parts by weight of rubber is mixed with 50 parts by weight of graphite,
It is not always possible to obtain a thermal conductivity of 1.3 × 10 ⁻³ cal / cm sec ° C., and the thermal conductivity also depends on a mixture other than graphite (for example, carbon black).

[0007]

EXAMPLE An example of the present invention will be described below. Explaining according to FIG. 1, a vibration-proof rubber 10 for a stepping motor.
The metal member 12 and 13 are adhered to both end surfaces of the rubber material 11, and a cylindrical hollow hole 14 is provided in the center so that the drive shaft of the stepping motor can be inserted therethrough. The metal fittings 12 and 13 each have two protrusions 15 and 1 respectively.
5, 16 and 16 are provided, and the projecting portions 15 ... 16 ... Are provided with mounting holes 17, 17, 18, 18 having screw grooves. Then, for example, the bottom portion of the stepping motor is attached to the mounting holes 17 and 1 of the metal fitting 12 of the rubber cushion 10.
The stepping motor anti-vibration rubber 10 is fixed by screwing it to 7 and screwing the other metal fitting 13 to the mounting plate of the device using the mounting holes 18, 18.

The rubber material 11 of the vibration-proof rubber 10 having such a structure
Was formulated as shown below, and used as Examples 1 to 6 and Comparative Examples.

[Example 1] 100 parts by weight of chloroprene rubber was mixed with process oil (Corrolex # 2, manufactured by Nippon Oil Co., Ltd.)
20 parts by weight, anti-aging agent (Ouchi Shinko Chemical Co., Ltd. Nocrac 630) 2 parts by weight, stearic acid 1.3 parts by weight, zinc white 5 parts by weight, magnesium oxide (Kamishima Chemical Co., Ltd. StarMag M) 4 parts by weight, 0.67 parts by weight of a vulcanization accelerator (Kawaguchi Chemical Co., Ltd. Axel 22R) and 50 parts by weight of graphite powder (Showa Denko KK) were kneaded to obtain a thermal conductivity (JIS R 2
618) is 1.3 × 10 ^-3 cal / cm sec ℃
Made rubber material. This rubber material is subjected to zinc plating-chromate treatment to obtain an adhesive (Chemlock # 205 / # 2
20) Coat with metal fittings 12 and 13 applied to the mold, 1
It was heated and pressed at 70 ° C. for 10 minutes to obtain a vibration-proof rubber as shown in FIG. A stepping motor (103-770-1 manufactured by Sanyo Denki Co., Ltd.) was fixed to the mounting plate via the anti-vibration rubber, and the step angle was 1.8 ° and the frequency was 1000 pulse / sec.
It was driven by. The temperature of the bottom plate of the stepping motor 60 minutes after the start of operation is measured by a temperature recorder (Yokogawa Kitatsuden Electric Co., Ltd. 30
87) to obtain a final temperature of 80 ° C (room temperature 25 ° C). [Example 2] In the rubber compound of the vibration-proof rubber of Example 1, 70 parts by weight of graphite powder was used, and the thermal conductivity was 1.9x10.
A rubber material of ^-3 cal / cm sec ℃ was prepared. An anti-vibration rubber was produced using this rubber material, and the temperature was measured by the same method as in Example 1 to obtain a final temperature of 76 ° C. [Example 3] In the compounding of the rubber material of Example 1, 70 parts by weight of graphite powder and 20 parts by weight of carbon black (Denka Black manufactured by Denki Kagaku Kogyo Co., Ltd.) were newly added to obtain a thermal conductivity of 2.2. A rubber material having a temperature of × 10 ^-3 cal / cm sec ° C was prepared. An anti-vibration rubber was produced using this rubber material, and the temperature was measured by the same method as in Example 1 to obtain a final temperature of 74 ° C. [Example 4] A rubber material having 70 parts by weight of graphite powder and 30 parts by weight of carbon black in the blend of the rubber material of Example 3 and having a thermal conductivity of 2.6 x 10 ^-3 cal / cm sec ° C. It was created. An anti-vibration rubber was made using this rubber material, and the temperature was measured by the same method as in Example 1 to obtain a final temperature of 72 ° C. [Example 5] A rubber having 150 parts by weight of graphite powder, no carbon black added, and a thermal conductivity of 4.8 x 10 ^-3 cal / cm sec ° C in the rubber material of Example 1. I made wood. An anti-vibration rubber was made using this rubber material, and the temperature was measured by the same method as in Example 1 to obtain a final temperature of 68.
C was obtained. Example 6 A rubber having 200 parts by weight of graphite powder in the rubber material of Example 1 and having a thermal conductivity of 7.1 × 10 ⁻³ cal / cm sec ° C. without adding carbon black. I made wood. An anti-vibration rubber was made using this rubber material, the temperature was measured by the same method as in Example 1, and the final temperature was 64%.
C was obtained. [Comparative Example] Graphite powder was not contained, but 53 parts by weight of carbon black (HTC # 80 manufactured by Chubu Carbon Co., Ltd.) was blended with 10 parts by weight of rubber, and the thermal conductivity was 0.7 × 10 ^-3 cal / cm s.
A vibration-proof rubber was created using a conventional rubber material at ec ° C. Then, this anti-vibration rubber was fixed to a stepping motor, and the temperature was measured in the same manner as in Example 1 to obtain a final temperature of 85 ° C.

The results of Examples 1 to 6 and the comparative example are shown in FIG. The bottom plate temperature of the stepping motor fixed via the conventional anti-vibration rubber (comparative example) rose to 85 degrees, but the rubber whose thermal conductivity was 1.3 × 10 ^-3 cal / cm sec ℃ or more was used. In the case of the anti-vibration rubber, the temperature does not exceed 80 ° C., and the final temperature decreases as the thermal conductivity increases.

[0011]

According to the present invention, the rubber material of the anti-vibration rubber is a good thermal conductive rubber, and a rubber compounded with graphite is used as an example of the rubber, so that a motor equipped with anti-vibration rubber can be used. It does not block heat generation and suppresses its temperature rise. Therefore, even if the motor is fixed via the anti-vibration rubber, the characteristics and service life of the motor are not reduced.

[Brief description of drawings]

FIG. 1A is a plan view showing a vibration-proof rubber of the present invention. (B) Sectional drawing which follows the same BB 'line.

FIG. 2A is a plan view showing a conventional anti-vibration rubber. (B) Sectional drawing which follows the same AA 'line.

FIG. 3 is an explanatory view showing a mounting state of a vibration proof rubber.

FIG. 4 is an explanatory diagram showing a correlation between a blending amount of graphite and a heat transfer coefficient with respect to 100 parts by weight of rubber.

FIG. 5 is an explanatory diagram showing a temperature rise of a motor when the embodiment of the present invention is fixed to a stepping motor.

[Explanation of symbols]

 10 ... Anti-vibration rubber 11 ... Rubber material 12, 13 ... Metal fitting 14 ... Hollow hole

Claims (2)

[Claims] 1. A vibration-proof rubber comprising a rubber material and metal fittings bonded to both end surfaces thereof, wherein the rubber material has a thermal conductivity of 1.3 × 10 ^−3.
Anti-vibration rubber, which is a rubber material of up to 7.1 × 10 ^-3 cal / cm sec ℃. 2. An anti-vibration rubber obtained by bonding metal fittings to both end faces of a rubber material, wherein the rubber material is a mixture of 100 parts by weight of rubber and 50 to 200 parts by weight of graphite. Anti-vibration rubber.